President Obama’s new budget for fiscal year 2015 is almost entirely free of surprises. The Obama administration supports a number of large tax increases, most but not all of which target high-income households, and so the budget assumes that revenues will grow faster than expenditures over the coming decades and that debt levels will decline. One key reason the White House is able to paint so rosy a picture is that its economic assumptions are different from those of the more buttoned-up Congressional Budget Office. Specifically, the Office of Management and Budget, which is responsible for crafting the president’s budget proposal, maintains that the U.S. economy will be 2 percentage points bigger in 2024 than it will be in the CBO’s projection.